Abstract
This chapter discusses material selection and damage tolerance criteria. Engineering applications of fatigue and fracture technologies will be discussed in this chapter including material selection and fracture prevention, weld improvement and repair, damage assessment and damage tolerance criteria, and nondestructive inspection. Causes of damage are investigated, and repaired damage or weld details are modified when necessary. Damage tolerance criteria are discussed. Feedback from the process of inspection, cause investigation, repair, and modification are given for design through rule changes and the development of design guidance such as fatigue-resistant details. This chapter emphasizes the importance of material selection and fracture prevention including subsections addressing material selection, higher strength, and prevention of fracture. Weld improvement and repair is also explained in various subsections. Comparison of different techniques allows assessment of their effectiveness and cost. Recommended improvement strategies depend on the characteristics of the structure and the preference for one technique over others is based on cost-effectiveness and fabrication yard characteristics. The section “Damage Tolerance Criteria” is devoted to fatigue cracks. A damage tolerance analysis for fatigue cracks makes use of fracture mechanics to quantitatively assess the residual strength and residual life of a cracked weld detail. The discussions in this chapter are made using fatigue and fracture as an example. Similar discussions may be made about corrosion defects and wear-out.
Published Version
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